Effect of addition of N on L10 transformation and atomic diffusion in FePt films

被引：16

作者：

Phatak, V. ^{[1
]}

Gupta, A. ^{[1
]}

Reddy, V. R. ^{[1
]}

Chakravarty, S. ^{[2
]}

Schmidt, H. ^{[2
]}

Rueffer, R. ^{[3
]}

机构：

[1] Consortium Sci Res, UGC DAE, Indore 452017, Madhya Pradesh, India

[2] Tech Univ Clausthal, Inst Met, D-38678 Clausthal Zellerfeld, Germany

[3] European Synchrotron Radiat Facil, F-38043 Grenoble, France

来源：

ACTA MATERIALIA | 2010年 / 58卷 / 03期

关键词：

L1(0) transformation; Self-diffusion; Nuclear resonance reffectivity; Secondary ion mass spectrometry; ALLOYS;

D O I：

10.1016/j.actamat.2009.10.014

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of nitrogen incorporation on the kinetics of L1(0) transformation in FePt alloy films was studied. Films with a maximum possible amount of nitrogen were prepared by sputtering a FePt compound target with pure nitrogen. As-prepared films consisting of nano-grains of Pt and Fe0.7N0.3 transformed to face-centered cubic FePt phase with a certain amount of nitrogen incorporated in the grains after annealing at 573 K. It was found that the presence of N results in faster kinetics of L1(0) transformation compared with pure FePt alloy films, as well as a substantial reduction in grain size. Detailed structural and diffusion measurements were carried out to elucidate the mechanism of enhanced transformation kinetics as well as grain size reduction. The activation energy for volume diffusion of Fe in FePtN films was found to be 0.27 +/- 0.14 eV, while that in FePt was 0.50 +/- 0.17 eV. Faster atomic diffusion in nitrogen-containing films was the cause of an enhanced rate of L1(0) transformation. Further studies reveal that, in partially transformed FePtN alloy films, N is incorporated mainly in the grain boundary region, which hinders grain growth and results in a smaller grain size. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：979 / 988

页数：10

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